I posted this on another forum site, but suspected that Black Hats have a lot more experience with this Google issue. I saw a few client sites of mine drop about 50+ spots from the 2nd page in the past few days, and I knew something was up. Then, in Google Webmaster tools, I find the following message from Google regarding each of these rapidly dropping sites: Dear site owner or webmaster of mywebsite We've detected that some of your site's pages may be using techniques that are outside Google's Webmaster Guidelines. Specifically, we detected low-quality pages on your site which do not provide substantially unique content or added value. Examples could include thin affiliate pages, doorway pages, automatically generated content, or copied content. For more information about unique and compelling content, visit ww:..... We encourage you to make changes to your site so that it meets our quality guidelines. Once you've made these changes, please submit your site for reconsideration in Google's search results. If you have any questions about how to resolve this issue, please see our Webmaster Help Forum for support. Sincerely, Google Search Quality Team" ---END MESSAGE---- These sites were NOT spammy sites, nor did they have any adsense, or affiliate ads AT ALL. They did, however, shoot up quite rapidly in search engine rankings, as a result of fairly diligent SEO efforts. Have you ever had this happen to you? Were you able to bounce back, and if so, how long did it take you? I've been doing this for a very long time, and have never ran into this issue. These particular websites are in a niche in which they each have a good amount of original content, and some aspects that are the exact same real estate properties in which they are listed under appropriate regions and categories. I think this is what is triggering the "low quality" content. The sites do share common property listings with similar descriptions, but this content is less than 1/3 of the site's content... and the rest is mostly original, with various Wikipedia information cited in regional information pages. The BEST part...One of these websites was JUST about to hit Page 1 for a ridiculously tough keyword. We win some.. we lose some, huh? I'm confident I'll bounce these back up soon enough. Thanks in advance for the feedback!